The IS fifteen three (153) series of loudspeakers are specifically designed for providing reinforcement in fixed installations where high sonic performance and flexibility in precise pattern control are critical. Precision designed with Mathematically Modelled Dispersion ™ the fifteen three series provide exceptionally linear pattern control through crossover making the series perfect for critical applications. Active versions used in conjunction with Klein+Hummel K8 products provide a factory tuned and easily-managed reinforcement system for night clubs, auditoria, houses of worship, performance halls, arenas and stadiums.

Specs for 153 SP Active Backplate Option
The self powered backplate shall provide digital signal processing, biamplification, factory set tuning and loudspeaker optimization, digital input compatible to K+H K8 distribution standard; selector switch for K8 digital channel which can be overridden in remote software; +4 dBu nominal analog input on XLR female and terminal block connectors; wink LED for speaker identification; input overload LED for analog input; analog input level trim; remote monitored termination switch; remote control and monitoring of amplifier including termperature, load condition and performance.

Driver	LF: 15" with 4" voicecoil , MF/HF: 2"/1" dual concentric driver, horn loaded
Useful operating frequency range	58 Hz to 22 kHz
Smooth frequency range (fullrange and active versions only)	90 Hz to 19 kHz, +/- 3 dB
System sensitivity ( with passive crossover)	98 dB/1W/1m
Driver sensitivity	LF: 98 dB/1W/1m, MF/HF: 115 dB/1W/1m
Coverage Pattern	80° horizontal x 50° vertical, nominal, field rotatable (85 Option) 50° horizontal x 40° vertical, nominal, field rotatable (54 Option)
Directivity Factor (Q)	tba
Directivity Index (DI)	tba
Passive Crossover	LF/MF: 600 Hz, 2nd order MF/HF: 6500 Hz, 2nd order
Impedance	LF: 4 ohms, MF/HF: 16 ohms
Crossover impedance (fullrange version only)	4 ohms nominal, 3.2 ohms minimum
Max. SPL measured (fullspace)	135 dB, peak 128 dB, average, 10% THD 121 dB, average, 3% THD
Max. SPL calculated (fullspace)	132 dB, peak 129 dB, average
Power Handling: RMS, program and peak (10ms)	800 watts rms, 1600 watts program, 3200 watts peak (10ms)
Input	Speaker level, 2 Speakon NL4 (fullrange) Speaker level, 2 Speakon NL4 (direct wired for biamp) +4 dBu, XLR female and terminal block (active version) K8 input, K8 link (active version), K8 channel select, rotary switch (active version)
Output	K8 link, passively coupled, (on active loudspeaker version)
Indicator lights	K8 Sync, K8 Wink, Input Overload (active version)
Termination	4 position DIP, remote monitored (active version)
Cabinet material	18 mm birch plywood
Cabinet finish	Black acrylic enamel
Grille	Painted steel Grille, 64% open, foam backing
Weight	46 kg (105 lbs), with passive crossover
Dimensions	H: 774 mm, W(front): 437 mm, W(rear): 182 mm, D: 502 mm 30.47“ H x 17.2“ W (front), 7.16“ W (rear) x 19.764“ D
Rigging points	(12) M10 threaded points
Side angle	20° each side